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Nrrn STATES GEORGE P. VINCENT, OF COI-IOES, NEV YORK, ASSIGNOR OFONE-HALF TO FRANK lV. IIORROBIN, OF SAME PLACE.

sTRAic HTWAY erop-VALVE.

SPECIFICATION forming part of. Letters Patent No. 554,205, datedFebruary 4, 1896.

Application led February 23, 1895. Serial No. 539,383. (No model.)

Z" 0 all when?, t may concern:

Beit known that I, GEORGE l). VINCENT, of Cohoes, in the county ofAlbany and State of New York, have invented new and useful Improvementsin Straightway Stop-Valves, of which the following is a full and exactdescription, reference being made to the accompanying drawings, whichform part of this specification, and in which- Figure 1 is alongitudinal section of my valve with the water-way closed; Fig. 2, atransverse vertical section of the valve-casing at the irregular line XX with the nut, part of the screw-stem, wedge-piece, and one of thegates in elevation; Figs. 3, 4, and 5, detached details of one of thegates of the valve; Fig. G, a rear elevation of the other gate; Eig: 7,a like elevation of the same with the wedge-piece in position; Fig. 8, atransverse section of Fig. G at the line Y Y; Fig. 9, a transversesection of Fig. 6 at the line Z Z; Eig. l0, an inverted plan view of thewedge-piece, and Fig. 1l an inverted plan View of the nut.

This invention relates to improvements on the class of stop-valves inwhich the waterway is governed by means of sliding gates that are fittedto form a water-tight joint with oppositely-located valve-seats; and myinvention consists of` the novel construction and arrangement of partsshown in the drawings and described in this speciiication.-

As illustrated in the drawings, A designates a valve-casing including acentral valvechamber, 1, having oppositely-located valveseats 2, eachprovided with an opening or water-way 3 that leads into a nozzle 4L atthe corresponding end of the valve-casing, guides 5 at opposite sides ofsaid water-way, a throat G, leading from the upper part of thevalvecasing into the valve chamber 1, and an abutment 7 at the lowerpart of said valvechamber.

The valve for closing the water-way 3 consists of two gates 8 and 9,whose faces have the form of disks which are fitted to form water-tightjoints with the valve-seats 2. The y for a purpose that will be shortlyexplained herein. Following the latter are inclined planes l2, which,starting from the plane of the back of the gate 8, incline toward thecenter of the valve-chamber when said gate is in its place in thevalve-casing A,`and studs 13 are formed at the lower end of saidinclined planes to form a seat for the wedge-piece hereinafterdescribed. The back of the gate 9 is also hollowed, as at 14, to allowthe screwstem of the valve to pass loosely therein. A rectangular recessl5 is formed at the lower end of said hollow, and the recesses 11 and l5are so arranged that when the gates 8 and 9 are at the lowest phase 'oftheir movement the lower side of both recesses will range on the sameline; but the recess 15 being higher than the same dimension of therecess 11 the upper side of' the recess 15 will be at a higher planethan the upper side of the recess 11, as shown in Fig. l, and thisdifference in the two recesses is made for the purpose of allowing arising movement of the gate S to begin before a corresponding movementof the gate 9 occurs. y

Below the recess l5 a hollow 16 is formed in the back of the gate 9, andat the lower side of said hollow a flange 17 is formed for a purposevthat will be soon explained. B is a wedgepiece which is approximatelysemicylindrical in form and is hollowed out, as at 1S, to allow the endof the screw-stem to enter loosely therein, as shown in Fig. 2, thelower end of said wedge-piece being made closed to take against theabutment 7 when the valve has nearly completed its closing movement, andat the upper end of said wedge-piece a flange 19 is formed slightlyeccentric to the convex surface of said wedge-piece, said flange beingadapted to bear upon the upper face of flange 17 of` the gate 9 when thelatter is in its raised position, as shown in Fig. 2, and the portion ofsaid wedge-piece at the two ends of the flange 19 is beveled to forminclined planes 20, which will coact with the inclined planes 12 on theback of the gate 8 to eect the spreading apart of the gates 8 and 9 inthe closing movement of the valve.

C is a nut in which a screw-stem by which the valve is operated isfitted to engage. The body of said nut has a cylindrical form IOO andits lower end is provided with a square head 21 whose sides will fitinto the recess 11 in the gate 8 but will enter loosely into the recess15 of the gate 9 for the purpose hereinbefore stated.

D is a bonnet that forms a closure for the upper end of the throat 6 andalso is iitted to receive the screw-stem, and to effect that purpose astuffing-box 22 is fitted to screw into the top of said bonnet so as toform the upper side of a circumferential groove 23, in

which a collar on the screw-stem is tted to rotate when occasion mayrequire. The stuffing-bex 22 is of a common and well-known constructionand for that reason does not require a particular description.

E is the screw-stem by which the opening and closing movements of thegates S and 9 are effected. Said screw-stem passes through thestuffing-box 22, and its outer end is provided with a hand-wheel 2i orother means for rotating it, and it is provided with a eollar 25, which,by being retained in the groove 23, will prevent said screw-stem fromattaining an endwise movement. A screw/thread 2G is formed on the innerportion of the screwstem to engage in a corresponding thread in the nutC, and the latter, having its head 21' retained in the recesses 11 and15, can only receive an up-and-down movement from said screw-stem.

It should be understood that by forming the wedge-piece B with a convexsurface where it fits into a corresponding concave in the ange 17provision is made for allowing the gates S and 9 to automatically adjustthemselves to any slight variation from parallelism in the twovalve-seats 2 of the easing A.

My invention operates in the following manner: When the gates S and 9are raised to open the water-way 3, as shown in Fig. 2, the wedgepiece Bwill be suspended by its flange 19 resting on the flange 17 of gate 9,and the latter will have the upper side of its recess 15 resting on thehead 2l of the nut C, and both gates will be loosened from thecorresponding valve-seats 2; but under this condition the gate 9 will belower than the gate S. To close the water-way 3 the screw-stem E must berotated in a direction to move the nut C downward, and just before thegates 8 and 9 are in position to fully cover the valve-seats 2 the lowerend of the wedgepiece B will take against the abutment 7 and arrest thefurther descent of said wedge-piece,and the continued rotations of thescrew-stem E will cause the gate S to descend, and by the coaction ofthe inclined planes 12 and 20 the gates S and 9 will be moved apart tocarry the faces of said gates into contact with the valve-seats 2 andform a water-tight joint therewith. By turning the screw-stem E in adirection to raise the gates 8 and 9 the head 21 of nut C by takingagainst the upper side of the recess 11 before it takes against thecorresponding side of the recess l5 will cause the gate 8 to begin anascending movement before the gate 9 begins to rise, and thereby thegates 8 and 9 will be freed from frietional Contact with the valve seats2. Then by the continued rotations of the screwstem E the gates can beraised to entirely open the water-way 3.

What I claim as my invention, and desire to secure by Letters Patent ofthe United States, is

1. The combination with a valve-casing, A, provided withoppositely-located valve-seats, 2, each having a water-way, 3, formedtherein as herein described, of a valve formed of two separable disks, 8and 9, a screw-nut, C, provided with a head, 21, which is adapted toengage with both of said disks, and a concave-convex wedge-piece, B,havingon its hollow side-inclined planes,.20, fitted to engage with likeplanes on the back of the disk S and-at the base of the planes 20-aIiange, 19, arranged to engage with studs, 13, on the disk 8; the latterhaving in its back a recess, 11, in which the head 21 engages, the disk9 having--in its back-a recess, 15, in which the head 21 has a slightlost movement; the back of the disk 9 also having a flange, 17, whichforms a seat for carrying the wedgepiece B; the latter being arranged toafford a slight rotative movement of the disk 9, so as to allow thelatter to automatically adjust itself to the valve-seat to which it isappropriated; the head 2l being adapted-by the difference in height ofthe recesses 11 and 15- to slightly raise the disk 8 before the disk 9begins its rising movement, as herein specified.

2. The combination, with the valve-disks S and 9; vthe latter having inits back a concave depression, 1G, whose sides are parallel with theaxial line of said concave, of the concave-convex wedge-piece, B, havingthe form of a segment of a tube and fitted into the convex depression 16in such manner that the valve-disk 9 will automatically adjust itself tothe valve-seat to which it is appropriated the valve-disk 9 and thewedg'e-piece B being made independently of each other and of thevalve-disk S, as and for the purpose specified.

GEORGE P. VINCENT. lVitnesses:

FRANK W. HORROBIN, WM. 1l. Low.

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